Loading [MathJax]/jax/output/CommonHTML/jax.js

CBSE Questions for Class 12 Engineering Chemistry The D-And F-Block Elements Quiz 6 - MCQExams.com

More number of oxidation states are exhibited by the actinoids than by lanthanoids. The main reason for this is:
  • greater metallic character of the lanthanoids than that of the corresponding actinoids.
  • more active nature of the actinoids.
  • more energy difference 5f and 6d-orbitals than that between 4f and 5d-orbitals.
  • lesser energy difference between 5f and 6d-orbitals than that between 4f and 5d-orbitals.
Titanium shows magnetic moment of 1.73BM; then find out its oxidation state:
  • +1
  • +4
  • +3
  • +2
Magnetic moments of Cr(Z=24), Mn(Z=25) and Fe(Z=26), are x,y,z

They are in order:
  • x<y<z
  • x=y<z
  • x>y>z.
  • x=y=z
Which of the following elements do not show the properties characteristics of d-block elements:
  • Cu,Ag,Au
  • Zn,Hg,Cd
  • Sc,Ti,V
  • Fe,Co,Ni
The compound of vanadium has magnetic moment of 1.73B. The vanadium chloride has the formula:
  • VCl2
  • VCl3
  • VCl4
  • VCl5
Lanthanoids contraction is caused due to:
  • the same effective nuclear charge from Ce to Lu
  • the imperfect shielding of outer electrons by 4f electrons from the nuclear charge
  • the appreciable shielding of outer electrons by 4f-electrons from the nuclear charge
  • the appreciable shielding of outer electrons by 5d-electrons from the nuclear charge
Which of the following belongs to the actinoids series of elements?
  • Y
  • Ta
  • U
  • P
Maximum magnetic moment is shown by:
  • d5
  • d6
  • d7
  • d8
The "Spin-only" magnetic moment [in units of Bohr magneton,(μB)] of Ni2+ in aqueous solution would be (At. no. Ni=28):
  • 0
  • 1.73
  • 2.84
  • 4.90
Which of the following elements involves gradual filling of 5f-level?
  • Lanthanoids
  • Actinoids
  • Transition metals
  • Coinage metals
In Cr2O27 every Cr is linked to:
  • two O-atoms.
  • three O-atoms.
  • four O-atoms.
  • five O-atoms.
Which one of the following ionic species will not impart color to an aqueous solution?
  • Ti4+
  • Cu+
  • Zn2+
  • Cr3+
In the dichromate dianion:
  • four CrO bonds are equivalent.
  • six CrO bonds are equivalent.
  • all CrO bonds are equivalent.
  • all CrO bonds are non-equivalent.
Which of the following is ferromagnetic.
  • Cu, Ag, Au
  • Fe, Co, Ni
  • Zn, Cd, Hg
  • Ca, Sr, Ba
The magnetism of Ni2+ ion is:
  • eh4πm
  • 6(eh4πm)
  • 8(eh4πm)
  • 10(eh4πm)
Elements with incomplete f-subshell are called:
  • d-block elements
  • outer transition elements
  • inner transition elements
  • f-block elements
The incorrect statement in respect of chromyl chloride test is?
  • Formation of red vapour
  • Formation of leas chromate
  • Formation of carbonyl chloride
  • Liberation of chlorine
Out of the ions Ag+,Co2+,Ti4+, which one will be coloured in aqueous solutions.

[Atomic no : Ag = 47, Co = 27, Ti = 22]
  • Ag+
  • Co2+
  • Ti4+
  • None of these
One unpaired electron in atom contributes a magnetic moment of 1.1 BM. The magnetic moment of Cr (Atomic number 24) is:
  • 4.6
  • 5.6
  • 6.6
  • 7.6
The ion that gives colourless compound:
  • Sc+3
  • V+3
  • Cr+3
  • All of these
The electronic configuration of Co2+ and Cu2+ is d7 and d9 respectively,which of these ions is expecteed to be more paramagnetic ?
  • Co+2
  • Cu2+
  • Both have same
  • None of these
Which one of the following paramagnetic in nature?
  • CuCl2
  • CaCl2
  • CdCl2
  • All of these
The chromate ion in acidic medium changes to .............. 
  • CrO24
  • Cr3O210
  • Cr2O27
  • none of these
Which of the following ion is not coloured ?
  • Ni(DMG)2
  • [Co(SCN)4]2
  • [Fe(H2O)5SCN]2+
  • [Al(OH)4]
The transition metal used in X-rays tube is :
  • Mo
  • Ta
  • Tc
  • Pm
If each one of the above ionic species is in turn kept in a magnetic field,  which  one will get attracted ?
  • Co+2
  • Mn+7
  • Sc+3
  • Ti+4
Raney nickel, which is used as a catalyst, is obtained:
  • by heating nickel tetracarbonyl
  • by grinding solid nickel
  • by treating nickelaluminium alloy with dilute NaOH
  • by treating nickelaluminium alloy with dilute HCl
Cholrine gas is produced from HCI by the addition of:
  • K2SO4
  • KCl
  • KNO3
  • KMnO4
Most copper (I) compounds are found to be colourless. This is due to :
  • presence of low oxidation state of copper
  • completely filled d-level in Cu(I)
  • diamagnetic nature of the compound
  • high polarizability of Cu(I) ion
The metal capable of gaining as well as losing an electron is:
  • Hg
  • Ca
  • Ag
  • Au
In the general electronic configuration,
(n2)f114(n1)d01ns2 (where n = 7) the configuration will be of:
  • lanthenides
  • actinides
  • transition elements
  • none
Which of the following is not a heavy metal?
  • Cu
  • Hg
  • Pb
  • K
The decreasing order of solubility of silver halide is:
  • AgI>AgBr>AgCl>AgF
  • AgF>AgCl>AgBr>AgI
  • AgCl>AgF>AgBr>AgI
  • AgBr>AgF>AgI>AgCl
The tendency towards complex formation is maximum in:
  • s-block elements
  • p-block elements
  • d-block elements
  • none of the above
Which of the following ions is colourless in solution?
  • V3+
  • Cr3+
  • Co2+
  • Sc3+
The pair that referred as 'chemical twins' is:
  • Ac, Cf
  • Hf, Ta
  • Tc, Re
  • La, Ac
 Generally transition elements and their salts are coloured due to presence of___________
  • coloured compounds and ions
  • coloured anions and cations
  • coloured particles and ions
  • unpaired electrons
Which of the following is coloured compound?
  • CuF2
  • CuI
  • NaCl
  • MgCl2
Select a ferromagnetic material from the following?
  • Dioxygen
  • Chromium (IV) oxide
  • Benzene
  • Dihydrogen monoxide
Most basic hydroxide among the following is:
  • Lu(OH)3
  • Eu(OH)3
  • Yb(OH)3
  • Ce(OH)3
Which one of the following metal ion is coloured?
  • Ti2+
  • Cu+
  • V4+
  • Zn2+
The point of dissimilarity between lanthanides and actinides is:
  • three outermost shells are partially filled
  • they show oxidation of +3 ( common)
  • they are called inner transition elements
  • they are radioactive in nature
Which of the following commonly forms an ionic compounds as a 1 anion?
  • C
  • N
  • O
  • Fe
  • Ne
The spin only magnetic moment of Ni2+ (in B.M.) in aqueous solution will be:
  • 1.73
  • 2.82
  • 3.42
  • 2.25
Copper (II) sulfate solution is:
  • red
  • purple
  • orange
  • green
  • blue
Platinum, Palladium and Iridium are called noble metals because:
  • Alfred Nobel discovered them
  • they are shining lustrous and pleasing to look at
  • they are found in native state
  • they are inert towards many common reagents
Which of the following ions has the maximum magnetic moment?
  • Co2+
  • Fe3+
  • Sc3+
  • Cr+3
Are the most readily oxidized elements within a given period
  • 3d Transition metals
  • Alkali metals
  • Halogens
  • Noble gases
  • Actinides
Which of the following is not an actinoid?
  • Curium(Z=96)
  • Californium(Z=98)
  • Uranium(Z=92)
  • Terbium(Z=65)
Identify the pairs of ions possessing equal spin only magnetic moments:
  • Co2,Ni+2
  • Co+2,Cr+3
  • Fe+2,Fe+3
  • Fe+2,Cr+3
0:0:2


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers